This does not seem specific to virt-who-config command but rather the whole CLI, moving to Hammer for further investigation of what we can do to improve experience here.
Created redmine issue https://projects.theforeman.org/issues/27595 from this bug
Moving this bug to POST for triage into Satellite 6 since the upstream issue https://projects.theforeman.org/issues/27595 has been resolved.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (Satellite 6.8 Satellite Tools Release), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2020:4367